Full-transparence high-strength self-repairing polyurethane elastomer as well as preparation method and application thereof

A polyurethane elastomer, high-strength technology, applied in the field of materials, to achieve the effect of improving strength and realizing physical entanglement

Active Publication Date: 2018-09-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current published literature, the self-healing polyurethane material fails to achieve the effect of glass transparency, and the fully transparent self-healing polyurethane material has become indispensable in the field of smart coatings such as optical devices, aerospace, and automotive surfaces. Material Variety

Method used

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  • Full-transparence high-strength self-repairing polyurethane elastomer as well as preparation method and application thereof
  • Full-transparence high-strength self-repairing polyurethane elastomer as well as preparation method and application thereof
  • Full-transparence high-strength self-repairing polyurethane elastomer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) Put 17.50 g of polytetramethylene ether glycol (molecular weight: 800) with a concentration of 20 mmol / L in a reaction kettle, heat to melt and stir thoroughly, raise the temperature to 120°C, and keep the vacuum degree of the reaction system at 0.08MPa Above, dehydrate for 2-3 hours; then fill with nitrogen, lower the temperature to 70°C, add 11ml of 4,4-diisocyanate dicyclohexylmethane with a concentration of 42mmol / L and 0.04g of dibutyltin dilaurate, and keep the vacuum degree of the reaction system at 0.08MPa or more, and react for 2-3h under the condition of filling nitrogen gas to generate isocyanate group-terminated polyurethane prepolymer.

[0046] 2) Mix 30ml of N,N-dimethylacetamide and 2.50ml of 2-hydroxyethyl disulfide with a concentration of 20mmol / L, add 10% polystyrene, stir and mix well, and then add to step ( 1) In the obtained isocyanate group-terminated polyurethane prepolymer, the reaction is continued for 2-3 hours to obtain a fully transparent ...

Embodiment 2

[0058] 1) Put 17.50 g of polytetramethylene ether glycol (molecular weight: 1000) with a concentration of 20 mmol in a reaction kettle, heat to melt and stir thoroughly, raise the temperature to 120° C., and keep the vacuum degree of the reaction system above 0.08 MPa, Dehydration for 2-3 hours; then fill with nitrogen, cool down to 70°C, add 16.2ml of 4,4-diisocyanate dicyclohexylmethane and 0.04g of dimethylamine, keep the vacuum of the reaction system above 0.08MPa, and fill with The reaction is carried out for 2-3 hours under the condition of nitrogen to generate a polyurethane prepolymer terminated by isocyanate groups.

[0059] 2) Mix 30ml of N,N-dimethylformamide and 5.2ml of 2-hydroxyethyl disulfide with a concentration of 20mmol, add 10% polyethyleneimine, stir and mix well, then add to step (1 ) In the obtained isocyanate group-terminated polyurethane prepolymer, the reaction is continued for 2-3 hours to obtain a fully transparent and high-strength self-healing poly...

Embodiment 3

[0065] 1) Put 17.5 g of polytetramethylene ether glycol (molecular weight: 3000) with a concentration of 20 mmol in a reaction kettle, heat to melt and stir thoroughly, raise the temperature to 120° C., and keep the vacuum degree of the reaction system above 0.08 MPa, Dehydrate for 2-3 hours; then fill with nitrogen, cool down to 70°C, add 21.5ml of 4,4-diisocyanate dicyclohexylmethane and 0.04g of ferric chloride, keep the vacuum of the reaction system above 0.08MPa, and fill with nitrogen Under the reaction 2-3h, generate isocyanate group-terminated polyurethane prepolymer.

[0066] 2) Get 30ml of chloroform and 7.6ml of 2-hydroxyethyl disulfide with a concentration of 20mmol and mix, add 5% polystyrene and polyethyleneimine (wherein the mass ratio of polystyrene and polyethyleneimine is 1: 1), fully stirred and mixed evenly, and then added to the isocyanate group-terminated polyurethane prepolymer obtained in step (1), and continued to react for 2-3 hours to obtain a fully ...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to full-transparence high-strength self-repairing polyurethane elastomer as well as a preparation method and application thereof. The full-transparence high-strength self-repairing polyurethane elastomer comprises carbamate and a disulfide bond structure unit, wherein the structural formula is shown in formula (I):(shown in the description), wherein the disulfide bond is designed and distributed in a hard section area in a split-phase control manner, so that a self-repairing and differential structure adjusting effect can be realized, and the physical and mechanical performance such as the strength and toughness can be improved. Compared with the polyurethane copolymer elastomer comprising the disulfide bond in the prior art, the full-transparence high-strength self-repairing polyurethane elastomer disclosed by the invention is far better in the mechanical strength, toughness, transparence and the likecompared with the traditional polyurethane elastomer.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a fully transparent high-strength self-repairing polyurethane elastomer, a preparation method and an application. Background technique [0002] Self-healing is the ability of the material itself to judge, control and recover from defects. It is one of the important characteristics of living organisms and one of the functions of smart materials. Materials with self-healing function can find cracks by themselves, and refill the cracks through a certain mechanism to heal themselves. At present, the methods of preparing self-healing materials are divided into two categories: one is to achieve self-healing by compounding functional substances inside the material, also known as external aid self-healing; the other is to provide energy to the system to make the material itself covalently Or non-covalent interaction to achieve self-healing, also known as intrinsic self-hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/10C08G18/32C08L75/08C08L25/06C08L79/02
CPCC08G18/10C08G18/4854C08G18/758C08L75/08C08L2201/10C08L2205/03C08G18/3863C08L25/06C08L79/02
Inventor 董侠来悦朱平匡晓刘学新王笃金
Owner INST OF CHEM CHINESE ACAD OF SCI
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